The Atsign FoundationThe Atsign Foundation

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The at_sync_ui_flutter package is for Flutter developers who want to implement the UI indicator for sync process.

This open source package is written in Dart, supports Flutter and follows the atPlatform's decentralized, edge computing model with the following features:

  • Cryptographic control of data access through personal data stores
  • No application backend needed
  • End to end encryption where only the data owner has the keys
  • Private and surveillance free connectivity
  • Display visual indicator for sync in progress

We call giving people control of access to their data “flipping the internet” and you can learn more about how it works by reading this overview.

Get started

There are three options to get started using this package.

1. Quick start - generate a skeleton app with at_app

This package includes a working sample application in the Example directory that you can use to create a personalized copy using at_app create in four commands.

$ flutter pub global activate at_app 
$ at_app create --sample=<package ID> <app name> 
$ cd <app name>
$ flutter run


  1. You only need to run flutter pub global activate once
  2. Use at_app.bat for Windows

2. Clone it from GitHub

Feel free to fork a copy of the source from the GitHub repo. The example code contained there is the same as the template that is used by at_app above.

$ git clone

3. Manually add the package to a project

Instructions on how to manually add this package to you project can be found on here.

How it works



It is expected that the app will first authenticate an atsign using the Onboarding widget.

The AtSyncUIService needs to be initialised with a required GlobalKey

        appNavigator: navKey,
        style: _atSyncUIStyle,
        onSuccessCallback: _onSuccessCallback,
        onErrorCallback: _onErrorCallback,

The app can select:

  • the style of the UI either Material or Cupertino by passing the style param to init() call.
  • the type of overlay to be shown while syncing either Dialog or Snackbar by passing the atSyncUIOverlay param to init() call.
  • the onSuccessCallback will be called everytime sync completes with success.
  • the onErrorCallback will be called everytime sync completes with failure.
  • the primaryColor, backgroundColor, labelColor will be used while displaying overlay/snackbar.


To call sync and show selected UI:

        atSyncUIOverlay: AtSyncUIOverlay.snackbar,

To use listener; can be used to listen to sync status changes:


Plugin description

This plugin provides the following material and cuppertino widgets:

  • AtSyncButton
  • AtSyncIndicator
  • AtSyncLinearProgressIndicator
  • AtSyncText
  • AtSyncDialog
  • AtSyncSnackBar

Sample usage


    isLoading: isLoading,
    syncIndicatorColor: Colors.white,
    child: IconButton(
        icon: const Icon(,
        onPressed: ...,


    value: progress,
    color: _indicatorColor,


    value: progress,
    color: _indicatorColor,


    value: progress,
    child: const Text('completed'),
    indicatorColor: _indicatorColor,


final dialog = material.AtSyncDialog(context: context); 'Downloading ...');
dialog.update(value: _value, message: 'Downloading ...');


final snackBar = material.AtSyncSnackBar(context: context); 'Downloading ...');
snackBar.update(value: _value, message: 'Downloading ...');


We have a good example with explanation in the at_sync_ui_flutter package.

Open source usage and contributions

This is open source code, so feel free to use it as is, suggest changes or enhancements or create your own version. See for detailed guidance on how to setup tools, tests and make a pull request.